Quartering attachment for driving-wheel lathes



S. W. PUTNAM. 3D

OUARTEBTNG ATTACHMENT FOR DRIVING WHEEL LATHES.

APPLICATION FILED MAY I6, i919... l

Patented Dec. 30,1919.

5 SHEETS-SHEET I.

Y S. W. PUTNAM. 3D. QUARTERTNG ATTACHMENT TGR DRIVING WHEEL LATHES.

APPLICATLON FILED'MAY I6. 1919. .Y

Patented Dec. 30,1919.

5 SHEETS-SHEET 2 i s'. w. PUTNAM, so. QUARTERING ATTACHMENT FOR DRIVINGWHEEL LATHES.

. I APPLICATION FILED MAYI, I9I9. 1,326,783i `Patented Dec. 30,1919.

5 SHEETS-SHEET 3.

S W PUTNAM 3D QUARIERING AHAGHMENTZLFOR nmvlNG WHEEL L MHES.

APPLICATION EILL'ED MAY 16| 1919.'

Patented Dec. 3 0, 1919.

s SHEETS-SHEET 4.

v1,326,7fs3.

Y v i b h h h v S. W. PUTNAM-,3.1). QUARTERiNG ATTACHMENT EUR DRIVINGWHEEL LATHES.'

APPLICATxoN FILED MA.Y1.6,1919..

1 ,326,783. Patented Dec. 80, 1919.

5 SHEETS-SHEET 5.

frig.

UNITED STATES PATENT OFFICE.

SALMON W. PUTNAM, 3D, OF ROCHESTER, NEW YORK, ASSIGNOR TO ARTHUR H.INGLE, 0F ROCHESTER, NEW YORK.

Specication of Letters Patent.

Patented Dec. 30, 1919.

Application led May 16, 1919. Serial No. 297,482.

To all u2/wm t may concern:

Be it known that I, SALMON W. PUTNAM, 3d, a citizen of the UnitedStates, and resident of Rochester, county of Monroe, State of New York,have invented an Improvement in Quartering Attachments forDriving-VVheel Lathes, of which the following description, in connectionwith the accompanying drawings, is a specification, like characters onthe drawings representing like parts in each of the several views.

This invention relates to attachments for metal working lathes,particularly of the n type employed for finishing the driving wheels oflocomotives. The finishing of locomotive driving wheels involves,besides the turning operations concentric with the wheel axis, thefurther operatioiis of boring and iinishing holes in the respectivewheels to receive the crank pins for the connecting rods, these crankpins being spaced radially away from the wheel axis varying distancesfor diii'erent engines, according to the length of the piston stroke inany particular case. Since these crank pin holes are spaced angularly 90apart on the respective driving wheels on a given axle, the operation ofboring and finishing these crank pin holes is commonly known asquartering and apparatus for the purpose is known as a quarteringattachment.

For this quartering operation, special machines have been developed andsupplied, but since these machines must be relatively massive to handlethe heavy work with a resulting large cost, which has beendisproportionate to the amount of work involved, it has been sought todispense with a special machine for the crank pin hole turning, or

uarterino' and to e ui the drivin@ wheel v lathe itself with anattachment to perform this operation with the pair of driving wheelsheld on the lathe centers, the same as they are mounted for the turningoperations. This has involved the slotting and consequent weakening ofthe face plate of the lathe, to permit the fitting therethrough of aboring bar bearing at its inner end a cutting tool for finishing thecrank pin hole. Since, in order to be of general utility, such anattachment must be capable of boring crank pin holes for engines ofrelatively short stroke, z'. e., with the crank pin relatively near theaxis aswell as for longer stroke engines, this has necessitated anelongated radial slot in the face plate, extending downwardly relativelyclose to the axis with a resulting weakening of the face plate, andparticularly of the front spindle cap or bearing, which has to be cutaway materially to allow clearance for the boring bar. This necessarycutting away of the front spindle bearing cap and of the face plate toadapt the driving wheel lathe for a quartering attachment has thusmaterially impaired the serviceability of driving wheel lathes for theirprimary purpose of finishing driving wheels and rendered them much lessable to withstand the enormous strains incident to the turning of tires.

The object of the present invention is to provide a quarteringattachment which may be conveniently applied to a driving wheel lathe ina manner so that the bearing cap is not at all cut away or weakened andwhere the slot in the face plate is farther away from the axis thanheretofore, these results being obtained by providing separate centersoffset from the lathe centers and adapted to be applied to the lathespindles when the machine is to be used for quartering, it beingunderstood that the lathe spindles are then locked stationary.

The foregoing and other objects and advantages of the invention will bebetter understood from the following detailed description, taken inconnection with the accompanying drawings and the distinctive featuresof novelty will then be pointed out in' the appended claims.

Referring to the drawings,

Figure 1 is a lengthwise vertical section, showing a driving wheel latheequipped with a quartering attachment;

Fig. 2 is an enlarged transverse section thereof, on line 2 2 of Fig. l;

Fig. 3 is a lengthwise vertical section, corresponding to Fig. l, butshowing the lathe equipped with the olf-set auxiliary centers and withthe special mounting of the quartering attachment involved in myinvention;

Fig. l is an enlarged transverse section on line 4-4 of Fig. 3;

Fig. 5 is an elevation, showing a pair of driving wheels fixed on acommon axle and being the work with which the invention is concerned ;l

Fig. 6 is an end view of looking from the left in Fig. 5; and

Fig. 7 is an end view, looking from the right in Fig. 5.

`The work operated on by the present the driving wheel,

mechanism is illustrated in Figs. 5, 6 and 7 asa pair of locomotivedriving wheels 10, 10u fixed as usual on an axle 11. These drivingwheels have their cranks 12, 12a set ninety degrees apart and hence theoperation of boring the crank pin holes 13, 13a therein is commonlyknown in the art as quartering, This operation of boring the crank pinholes is sometimes performed on a machine specially designed for thepurpose with rotarily driven boring bars offset the required distancefrom the lathe centers but on account of the heavy character of the workthe cost of such a machinehas been in most cases disproportionate to theamount of work of this kind in hand. rlhere has hence been a demand fora quartering attachment which might be applied to the regular drivingwheel lathes but such attachments as heretofore proposed have beensubject to the objection that in order to mount the boring bar with acapability of radial adjustment so as to bring it near enough to thelathe axis for boring crank pin holes in relatively short strokeengines, c. g., a twenty-two inch stroke which would require the boringbar to be positioned eleven inches from the lathe centers, the topportion of the bearing cap of the lathe spindle has to be cnt away somuch to afford clearance for the boringbar as to seriously weaken thelathe and render it unreliable for withstanding the enormous strainsincident to its primary purpose, i. c., the turning of the wheel tires.lt has also been necessary to slot the face plate inward to the centralhole thereof weakening thisalso. ln Figs. 1 and 2 l show a lathe bed 1lequipped with spaced apart columns 15, 1G in which are rotatably mountedspindles 17 18 respectively equipped with usual. centers 17,.18 forpositioning the axle 11 with the driving wheels 10, 10 thereon. lThespindles 17, 18 have fixed at the inner ends thereof the face plates 19,2O respectively. these face plates having gears 19, 20n carried therebyto ac tuate the same for turning tires and the like by drivingconnections of usual character, that having no relation to the presentinvention are not shown herein. lWhen the machine is to be used forquartering purposes the face plates 19, '20 are locked stationary andfor this purpose l show looking pins 21 adapted to engage in holes ofthe face plate, these pins being slidably mounted in fixed blocks 22 ofthe base. v3 indicates a boring bar equipped with a cutting tool 23a forboring the crank pin holes. rFhis bar is journaled in bearing blocks24s. 25 adjustably mounted in standards Q6 on the column. 15, theparticular means for adjusting these blocks simultaneously being shownas screws 27 journaled in the respective standards 26 and engaged withthe respective blocks 24, 25, the tops of these screws having beveledgear connection 28 with a common shaft 29 journaled at its ends in thetwo standards 26 and having a hand wheel 30 thereon to actuate the same.The shaft 23 has a key way along the outer end portion thereof and it isslidably fitted and held to turn with a sleeved gear 31 which is keyedthereon, the gear 31 being driven by a pinion on a shaft 32 which has adriving belt wheel 32 fixed thereon. By suitable mechanism not shown andwhich forms no part of the present invention the boring bar or shaft 23is provided with a means for power feeding and hand motion laterally inone or both directions.

The bearing caps for the spindle 17 are shown at 33, 33a at the top ofthe column 15. For adjusting the shaft 23 inward toward the lathe axisfar enough to bore the crank pin holes of short stroke engines thebearing cap 33 has to be cut away as indicated at 34 to an extent thatin practice,

and as shown, leaves only half or less of the normal thickness of thecap at the top thereof to resist the operative strains thereon which inturning tires are very great since the engagement of the tool of thework is such a long, distance radially outward from the spindle bearing.The face plate also requires to have an elongated radial. slot 35`therein extending inward to the central hole thereof to permittherequisite range of adjustment of the bar Q3 for the crank pins ofdifferent stroke engines, thus materially weakening the face plate also.

In accordance with the present invention and as shown particularly inFigs. 3 and l I provide support heads 36 adapted to be fitted in placeat the inner end of the spindles 17, 18 and within the axial passage ofthe face plates, these heads bearing auxiliary centers 37 thatare offsetwith reference to the lathe centers 17, 18 which are then withdrawnwithin the spindles so as to be out of the way. The axle 11 of thedriving wheels to be quartered is mounted on these auxiliary centerswhich are located in angular alineinent either directly over orobliquely disposed to the axis of the spindies. In this way-the crankpin holes are positioned substantially farther from the lathe axis andhence the boring bar is correspondingly removed from the bearing caps ofthe spindles. In this construction the standards 38 are fixed to theside of the column 17 in like manner as the standards 26 alreadydescribed and the means for vertically adjusting the boring bar 23 beingin all respects similar to that already described need not be againdetailed, the same reference characters being applied to the same parts.Thebearing blocks 241 forthe boring bar in this cas@ clear the top cap33 of the spindle bearing so that this does` not require to becut awayor reduced at all to 'afford the full range of adjustment necessary forthe boring bar. Also the slot in the face plate does not have to extendentirely to the spindle passage of the face plate. It is to be notedthat while only one of the spindie columns is shown equipped with thequartering attachment of the invention, that either one or both columnsmay be so equipped within the contemplation oi the invention, theequipment of only one column in this way, requiring that the wheels bereversed after boring the first hole. In cases where a quarteringattachment is applied to both of the spindle columns so that both holesmay be bored without shifting the Wheels, the boring bars should hepositioned ninety degrees apart, the boring bar located on the tailstock column being preferably arranged for horizontal radial adjustmentwhile the bar on the head stock column would be equipped for verticaladjust-ment. It will be understood that as previously suggested when atire turning lathe as described is employed for boring the crank pinholes, it ceases to be a lathe in the full sense of the word and becomesto all intents and purposes a quartering machine, the lathe properacting simply as a means of holding or sustaining the Wheels in properposition for boring the crank pin holes. The present improvement permitsthe construction of the lathe having maximuni eliiciency as a tireturning machine and oneI that without change is capable of utilizing thequartering `attachment for short stroke engines without cutting away thebearing cap or in any other way weakening' the lathe or impairing itseliiciency for heavy duty work. lVhile I have herein shown the supportheads 36 for the auxiliary centers as fitted in the axial holes of theface plate with the centers eccentric on the heads, it is to beunderstood that this showing is merely illustrative and that any othersuitable or convenient ,manner of mounting these auxiliary centers inoffset relation to the regular latheI centers might be employed. In thisas well as other particulars the present embodiment is to be understoodas illustrative and not restrictive, reference being had to the appendedclaims rather than to the foregoing description to indicate the scope ofthe invention.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

l. Apparatus of the kind described, comprising a lathe equipped with aface plate and an axial center for holding work, a boring tool mountedin parallelism with and at one side of said center extending throughsaid face plate to bore crank pin holes, and an auxiliary center adaptedto be mounted in oifset relation to said axial center.

2. Lathe mechanism, comprising work centering and driving meansincluding an axial center, a boring device mounted to operate at oneside of said center and in parallelism therewith, and an auxiliarycenter adapted to be applied in offset relation to said axial center forthe purpose stated.

3. Lathe mechanism, comprising work centering and driving meansincluding an axial center, a boring bar mounted in parallelism with saidcenter and for radial adjustment with respect thereto to bore crank pinholes or the like, and an auxiliary center adapted to be mounted inoliset relation to said axial center for the purpose stated.

4. Lathe mechanism, comprising a face plate, an axial center associatedtherewith, means for locking said face plate stationary at will, aboring bar mounted in parallelism with said axial center and at one sidethereof for radial adjustment with respect thereto, and an auxiliarycenter adapted to be applied in offset relation to said axial center forthe purpose stated.

5. Lathe mechanism, comprising work centering and driving means, anoperating tool mounted for adjustment toward and from said axial center,an auxiliary center adapted to be applied in offset relatign to saidaxial center, and means for locking said work driving means stationaryat will.

6. Apparatus of the kind described, comprising a pair of spaced apartwork driving face plates, a pair of axial centers associated therewithfor centering the work, a boring har mounted at one. .side of said axialcenters and in parallelism therewith, and a pair of auxiliary centersadapted to be. applied in oii'set relation to said axial centers for thepurpose stated.

7. Apparatus of the kind described, comprising a pair of spaced apartwork driving face plates, a pair of axial centers associated therewithfor centering the work, a boring bar mounted at one side of said axialcenters and in parallelism therewith, and means applied to said faceplates bearing centers offset with relation to said axial centers.

In testimony whereof, I have name to this specification.

sALMoN w. PUTNAM, en.

signed my

